I have some symptoms that are concerning me. Until ~ 6mo. ago i was in good health but don't feel that way now. 53 y.o. male. no other health diagnosis, no medications. Started experiencing noticeable fatigue, weight loss (~20lbs). No appetite, food doesn't taste good anymore, tongue feels a little swollen, weird (metallic?) taste in my mouth. My vision, which was slowly fading seems to have gotten significantly worse, and my eyes hurt (and itch) a lot. My neck is also stiff/sore. I'm worried that some genetic disease, autoimmune disorder or cancer is manifesting. I am going to a doctor for physical/tests next week. Any advice appreciated.